Freelancing before and after treatment

I'll be having plaque radiation for choroidal melanoma, and I need to maintain and at some point expand my current client base, for database editing work,, and also ask for a payment increase when new contract for long term client comes up end of June.I understand that I will need some time for recovery but not how much or how I'll feel. At 64, I have given up on in house work, and don't know how to network to increase client base in my particular and peculiar niche.